Improvement in the modes of machine-sewing



l. B. BLANCHARD.

Modes of Machine Sewing.

UNITED STATES PATENT OFFICE.

JOSEPH B. BLANCHARD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO FREDERICKCURTIS, OF SAME PLACE.

Specification forming part of Letters Patent No IMPROVEMENT IN THE MODESOF MACHINE-SEWING.

. l5 1,558, dated June 2, 1874; application iiled August 22, 1872.

To all whom it may concern:

Be it known that I, J osErH BOND BLANCH- ARD, of Boston, Suffolk county,Massachusetts, have invented a certain Method of Machine-Sewing, ot'which the following is a specification This invention is an improvedmode of machine-sewin g by the employment of two threads in conjunctionwith a two-cyed machine-needle, one eye for each thread, substantiallyas hereinafter specified.

The dra-wings accompanying this speeiiication represent, in elevation, asewinganachine needle, A, formed with two eyes, c a, these eyes beingplaced in axial aligmnent with the body b ofthe needle, and situated ashort distance asunder. These eyes are to be placed as close as possibletogether, leaving only so much metal between them as will sufiice tokeep them separated, in order that each thread may have its distincteye, while they all may be so 'close together as to bc readily taken bya single shuttle or hook, according to thekind of machine used.

In practical carrying out of my invention the several threads are to beinserted, one through each eye ot' the needle, and subsequently left totake care of themselves, as in ordinary sewinn'.

I have found in practice that each thread preserves at all times theposition with respect to th'e next adjacent one that it tool: originally5 hence, when colored threads areV employed for the purpose ofembroidering,

' each color will maintain its proper position.

, Under my invention sewing progresses in all respects as satisfactorilyas with one thread, and an ornamental or embroidering stitch in colorsis obtained with no more care or trouble than ordinary sewinO.

My invention is susceptible of ready application to any of the existingsewing-machines in the market, all the change that is required being anadditional spoolspindle for each additional thread. The same tension andtakeup can be employed for all the threads, no change in this respectbeing necessary.

By means of my invention I obtain several important advantages over anyformer system of sewing: First, the hole made by the needle, in whatevermaterial the puncture is made, is iilled entirely by the threads, and Iam thus enabled to use a comparatively small needle to obtain a largeand strong stitch. The value of this fact is more apparent in the sewingot' leather, as it is one oi" the greatest evils, in the sewing et' thismaterial by mainachinery, that the holes must be ot' such size as oftento cut the stock, and weaken the parts, and in all cases to detract fromthe iinished appearance ot' the work.

In sewing` heretofore, the dii'iicnlty ot' using a thread sutlicientlylarge to iilltheI needlehole has been found to consist with the eye ot'the needle. If an attempt is made to carry two or more threads in oneeye an instant failure is the result.

Ela-berate experiments have convinced me that, by the employment otl atwoeyed needle in accordance with my invention, I am enabled to use sucha quantity or' thread as will entirely iill any hole iliade by theneedle; and therefore I am enabled, as before stated, to either reducethe size of the needle and. avoid injury to the materia-l, as well asobtain a stitch equally as strong as any now laid, or to obtain, by theuse of the present-sized needle, a much larger and stronger stitch thancan now be obtained with it.

That I claim, and desire to secure by Letters Patent, is-

The herein-described-mode ot' machine-sewing, by the employment of twothreadsin conjunction with a sin gie machine-needle provided with eyes,one for each thread, the same being used in a sewing-machine ofotherwise ordinary or suitable construction, substantially in the mannerand for the purposes set forth.

JOSEPH B. BLANCHARD.

Witnesses:

Ii. CUETrs, W. E. BOARDM AN.

